:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --ink: #171615;
  --ink-2: #5d5a55;
  --ink-3: #6f6b64;
  --line: #e8e8e8;
  --line-strong: #171615;
  --accent: #b2965a;
  --radius: 10px;
  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Cormorant Garamond', Georgia, serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; color: inherit; }
h1, h2 { margin: 0; font-weight: 400; }

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.brand { font-weight: 600; letter-spacing: 0.22em; font-size: 14px; text-decoration: none; color: var(--ink); }
.topnav { display: flex; gap: 28px; }
.topnav a { color: var(--ink-2); text-decoration: none; font-size: 13px; letter-spacing: 0.04em; }
.topnav a:hover { color: var(--ink); }

/* ---- layout ---- */
.configurator {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, 520px);
  gap: 40px;
  max-width: 1360px;
  margin: 0 auto;
  padding: 32px;
}
.stage-wrap { position: sticky; top: 24px; align-self: start; }
.stage-box {
  position: relative;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  background: #ffffff;
}
.stage-canvas { position: relative; aspect-ratio: 1 / 1; max-height: calc(100vh - 100px); width: 100%; }
#stage { display: block; width: 100%; height: 100%; touch-action: pan-y; cursor: grab; }
#stage:active { cursor: grabbing; }
.stage-error { position: absolute; inset: auto 16px 50% 16px; transform: translateY(50%); text-align: center; font-size: 13px; color: #b4463c; background: rgba(255,255,255,0.9); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; }

.stage-top { position: absolute; top: 16px; left: 16px; right: 16px; display: flex; justify-content: space-between; align-items: center; gap: 12px; pointer-events: none; }
.stage-top > * { pointer-events: auto; }
.seg { display: inline-flex; background: rgba(255,255,255,0.85); backdrop-filter: blur(8px); border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.seg button { border: 0; background: transparent; padding: 7px 14px; border-radius: 999px; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.metals { display: inline-flex; gap: 8px; }
.metal { width: 36px; height: 36px; border-radius: 50%; border: 6px solid transparent; background-clip: padding-box; box-shadow: inset 0 0 0 1px var(--line); cursor: pointer; padding: 0; }
.metal[aria-pressed="true"] { outline: 1.5px solid var(--ink); outline-offset: -4px; }
.metal:focus-visible { outline: 2px solid var(--ink); outline-offset: 0; }
.metal-yellow { background: radial-gradient(circle at 35% 30%, #fff1c2, #d9b45a 60%, #a9833a); }
.metal-white  { background: radial-gradient(circle at 35% 30%, #ffffff, #d8d8d6 60%, #9d9d9b); }
.metal-rose   { background: radial-gradient(circle at 35% 30%, #ffe3d6, #e1a98f 60%, #b67b63); }

.stage-caption { position: absolute; left: 20px; right: 20px; bottom: 18px; display: flex; flex-direction: column; gap: 2px; pointer-events: none; }
.stage-title { font-family: var(--font-display); font-size: 24px; line-height: 1.1; }
.stage-dims { font-size: 13px; color: var(--ink-2); }
.stage-hint { font-size: 11px; color: var(--ink-3); letter-spacing: 0.04em; text-transform: uppercase; margin-top: 6px; }

/* ---- panel ---- */
.panel { display: flex; flex-direction: column; gap: 18px; }
.eyebrow { margin: 0; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); }
h1 { font-family: var(--font-display); font-size: 44px; line-height: 1.05; margin-top: -8px; }
.lede { margin: 0; color: var(--ink-2); max-width: 46ch; }

.group { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.group-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.group h2 { font-family: var(--font-ui); font-size: 13px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
.group-note { font-size: 13px; color: var(--ink-2); }

/* shapes */
.shape-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.shape {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 10px 4px 8px; border: 1px solid var(--line); border-radius: 8px; background: #fff; cursor: pointer;
  color: var(--ink-2); transition: border-color .15s, color .15s;
}
.shape svg { width: 40px; height: 40px; }
.shape span { font-size: 11px; }
.shape:hover { border-color: var(--ink-3); color: var(--ink); }
.shape[aria-pressed="true"] { border-color: var(--line-strong); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line-strong); }

/* carat */
.carat-row { display: flex; align-items: center; gap: 16px; }
input[type="range"] {
  --p: 20%;
  flex: 1; appearance: none; height: 2px; border-radius: 2px; outline: none; margin: 14px 0;
  background: linear-gradient(90deg, var(--ink) var(--p), var(--line) var(--p));
}
input[type="range"]::-webkit-slider-thumb { appearance: none; width: 22px; height: 22px; border-radius: 50%; background: #fff; border: 1.5px solid var(--ink); cursor: pointer; }
input[type="range"]::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; background: #fff; border: 1.5px solid var(--ink); cursor: pointer; }
input[type="range"]:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px rgba(23,22,21,0.18); }
input[type="range"]:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 4px rgba(23,22,21,0.18); }
.carat-num { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; }
.carat-num:focus-within { border-color: var(--ink); }
.carat-num input { width: 58px; border: 0; outline: 0; text-align: right; font-variant-numeric: tabular-nums; }
.carat-num span { color: var(--ink-3); font-size: 13px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chip { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 5px 11px; font-size: 12px; color: var(--ink-2); cursor: pointer; }
.chip:hover { border-color: var(--ink-3); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.hint { margin: 12px 0 0; font-size: 12px; color: var(--ink-3); }

/* form */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field label { font-size: 13px; color: var(--ink-2); }
.field input, .field textarea {
  border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; background: #fff; outline: none; width: 100%;
  transition: border-color .15s;
}
.field textarea { resize: vertical; min-height: 96px; }
.field input:focus, .field textarea:focus { border-color: var(--ink); }
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"] { border-color: #b4463c; }
.error { font-size: 12px; color: #b4463c; line-height: 1.3; } /* stays in the DOM so screen readers announce it */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

.btn-primary, .btn-secondary {
  width: 100%; padding: 14px 18px; border-radius: 8px; cursor: pointer; letter-spacing: 0.04em; font-weight: 500;
}
.btn-primary { background: var(--ink); color: #fff; border: 1px solid var(--ink); }
.btn-primary:hover { background: #2a2826; }
.btn-primary:disabled { opacity: .6; cursor: default; }
.btn-secondary { background: #fff; color: var(--ink); border: 1px solid var(--ink); margin-top: 12px; }
.form-status { margin: 0; font-size: 13px; color: #b4463c; }
.form-status:not(:empty) { margin-top: 10px; }
.form-status a { color: inherit; }

.thanks h2 { font-family: var(--font-display); font-size: 30px; text-transform: none; letter-spacing: 0; font-weight: 400; margin-bottom: 6px; }
.thanks p { margin: 0 0 8px; color: var(--ink-2); }
.thanks-summary { color: var(--ink) !important; }

/* ---- responsive ---- */
@media (max-width: 960px) {
  .configurator { grid-template-columns: 1fr; gap: 20px; padding: 16px; }
  .stage-wrap { position: static; }
  .stage-canvas { aspect-ratio: 1 / 0.92; max-height: 62vh; }
  .stage-caption { position: static; padding: 12px 18px 16px; border-top: 1px solid var(--line); background: #fff; }
  .stage-hint { display: none; }
  h1 { font-size: 36px; }
}
@media (max-width: 560px) {
  .topbar { padding: 14px 16px; }
  .topnav { display: none; }
  .shape-grid { grid-template-columns: repeat(5, 1fr); gap: 6px; }
  .shape svg { width: 32px; height: 32px; }
  .shape span { font-size: 10px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .stage-title { font-size: 20px; }
  .stage-top { top: 12px; left: 12px; right: 12px; }
  .seg button { padding: 6px 11px; font-size: 12px; }
  .metal { width: 32px; height: 32px; border-width: 5px; }
}